קידושין ד׳Kiddushin 4

Mishnah 1א׳

עֲשָׂרָה יוֹחֲסִין עָלוּ מִבָּבֶל, כַּהֲנֵי, לְוִיֵּי, יִשְׂרְאֵלֵי, חֲלָלֵי, גֵּרֵי, וַחֲרוּרֵי, מַמְזֵרֵי, נְתִינֵי, שְׁתוּקֵי, וַאֲסוּפֵי. כַּהֲנֵי, לְוִיֵּי וְיִשְׂרְאֵלֵי, מֻתָּרִים לָבֹא זֶה בָזֶה. לְוִיֵּי, יִשְׂרְאֵלֵי, חֲלָלֵי, גֵּרֵי וַחֲרוּרֵי, מֻתָּרִים לָבֹא זֶה בָזֶה. גֵּרֵי וַחֲרוּרֵי, מַמְזֵרֵי וּנְתִינֵי שְׁתוּקֵי וַאֲסוּפֵי, כֻּלָּם מֻתָּרִין לָבֹא זֶה בָזֶה:

Ten pedigrees emigrated from Babylonia [to Israel]: Priestly, Levitical, [Ordinary] Jewish, Invalidated Priestly, Converted, Freed, Mamzeric, Nathinitic, Silent Ones and Foundlings. Priestly, Levitical and [Ordinary] Jewish are permitted to mingle with each other [in marriage]; Levitical, [Ordinary] Jewish, Invalidated Priestly, Converted and Freed are permitted to mingle with each other; Converted, Freed, Mamzeric, Nathinitic, Silent Ones and Foundlings are permitted to mingle with each other.

Mishnah 2ב׳

וְאֵלּוּ הֵם שְׁתוּקֵי, כֹּל שֶׁהוּא מַכִּיר אֶת אִמּוֹ וְאֵינוֹ מַכִּיר אֶת אָבִיו. אֲסוּפֵי, כֹּל שֶׁנֶּאֱסַף מִן הַשּׁוּק וְאֵינוֹ מַכִּיר לֹא אָבִיו וְלֹא אִמּוֹ. אַבָּא שָׁאוּל הָיָה קוֹרֵא לִשְׁתוּקֵי, בְּדוּקֵי:

These are the Silent Ones: any who knows his mother, but does not know his father. [These are the] Foundlings: any who was gathered in from the market, and does not know either his father or his mother. Abba Shaul would call the Silent Ones "Checked Ones."